New Zealand Journal of Marine and Freshwater Research abstracts
Vertical distribution and diurnal migration patterns of Jasus edwardsii
phyllosomas off the east coast of the North Island, New Zealand
Russell W. Bradford
Barry D. Bruce
CSIRO Marine Research
G.P.O. Box 1538, Hobart
TAS 7001, Australia
email: Russ.Bradford@csiro.au
Stephen M. Chiswell
John D. Booth
Andrew Jeffs
National Institute of Water and Atmospheric
Research Limited
P.O. Box 14 901
Wellington, New Zealand
Simon Wotherspoon
School of Mathematics and Physics
University of Tasmania
Private Bag 37, Hobart
TAS 7001, Australia
Abstract The rock lobster Jasus edwardsii forms
the basis of important fisheries in south-eastern Australia and New Zealand.
Their long pelagic larval phyllosoma phase (12-24 months) raises many questions
as to how the larvae are retained and/or recruited into local populations.
Recent attempts to model the dispersal of J. edwardsii phyllosoma
have had mixed success at reconstructing settlement patterns. However, these
models have either ignored vertical distribution or have used that of the
western rock lobster, Panulirus cygnus. We report on the vertical
distribution and migration of J. edwardsii phyllosomas, collected
in March/April 2003 from the Wairarapa Eddy off the east coast of the North
Island, New Zealand, and provide a model to describe their vertical distribution.
J. edwardsii phyllosoma were primarily recorded within the upper 100
m over similar depth ranges to those reported for other palinurid and scyllarid
species. Well-defined changes in diel vertical distribution were restricted
to late-stage larvae. Mid-stage phyllosomas were concentrated in the upper
20 m both day and night. Late-stage phyllosomas were concentrated in the
upper 20 m during the night, but they were absent from the upper 20 m during
the day and distributed primarily between 20 and 100 m. Future modelling
will benefit from using larval distribution and behaviour patterns specific
to J. edwardsii.
Keywords Jasus edwardsii; rock lobster; Antipodarctus
aoteanus; scyllarid; vertical distribution; diurnal vertical migration; Wairarapa
Eddy; phyllosoma
M04095; Online publication date 8 June 2005 Received 16 April 2004; accepted
3 August 2004
New Zealand Journal of Marine and Freshwater Research, 2005, Vol. 39:
593-604
0028-8330/05/3903-0593 © The Royal Society of New Zealand 2005
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